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"The OPEN command opens communication with a device, which can be a disk file, a window, a dynamic-link library or a serial communications port." OPEN device FOR purpose AS # handle { LEN = n } Once a “device” is open, data and also commands to control that device can be “printed” to it.
PHP code is usually processed on a web server by a PHP interpreter implemented as a module, a daemon or a Common Gateway Interface (CGI) executable. On a web server, the result of the interpreted and executed PHP code—which may be any type of data, such as generated HTML or binary image data—would form the whole or part of an HTTP response.
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A guide on using colors in web design and development, covering color theory, accessibility, and practical applications.
Color-codes lines according to who has the top contribution for a page, with lighter, more readable colours. Color-codes lines of user contribution history, so that pages you've edited last are sharply distinguished from pages where another editor was the last to edit. 11: 6: user-tabs-on-contribs
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The PHP processor only parses code within its delimiters. Anything outside its delimiters is sent directly to the output and not parsed by PHP. The only open/close delimiters allowed by PSR-1 [6] are "<?php" and "?>" or <? = and ?>. The purpose of the delimiting tags is to separate PHP code from non-PHP data (mainly HTML).
Most modern code editors and IDEs allow you to set up a localhost server – eg. use atom-live-server in Atom, and Live Server in VS Code. WebStorm and PhpStorm have the feature built in, without requiring an extension. You can also use a third party program such as Node.js's npx http-server command (video tutorial), or XAMPP.